Year	Percent
1950	9.29665
1955	9.41904
1960	9.62139
1965	10.50987
1970	10.50151
1975	11.20792
1980	10.73723
1985	10.48131
1990	9.8299
1995	10.06711
2000	9.91285
2005	8.66083
2010	8.07215
2015	7.65152
2020	7.88791
2025	7.93244
2030	7.25096
2035	6.72937
2040	6.27896
2045	6.06802
2050	6.06828
2055	6.04291
2060	5.82459
2065	5.51276
2070	5.25708
2075	5.14162
2080	5.13725
2085	5.16374
2090	5.10417
2095	4.97199
2100	4.84185